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block: Mark bdrv_root_unref_child() GRAPH_WRLOCK

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Instead of taking the writer lock internally, require callers to already
hold it when calling bdrv_root_unref_child(). These callers will
typically already hold the graph lock once the locking work is
completed, which means that they can't call functions that take it
internally.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230911094620.45040-20-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-11 11:46:18 +02:00
parent 7f831d29e3
commit ede01e4635
4 changed files with 9 additions and 4 deletions
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6
block.c
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@ -3268,7 +3268,6 @@ void bdrv_root_unref_child(BdrvChild *child)
BlockDriverState *child_bs = child->bs;
GLOBAL_STATE_CODE();
bdrv_graph_wrlock(NULL);
bdrv_replace_child_noperm(child, NULL);
bdrv_child_free(child);
@ -3288,8 +3287,7 @@ void bdrv_root_unref_child(BdrvChild *child)
NULL);
}
bdrv_graph_wrunlock();
bdrv_unref(child_bs);
bdrv_schedule_unref(child_bs);
}
typedef struct BdrvSetInheritsFrom {
@ -3366,8 +3364,10 @@ void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
return;
}
bdrv_graph_wrlock(NULL);
bdrv_unset_inherits_from(parent, child, NULL);
bdrv_root_unref_child(child);
bdrv_graph_wrunlock();
}